Diodes Incorporated T12M50T600B

Overview

T12M50T600B from Lite-On is a 12 A RMS, 600 V bidirectional silicon thyristor (triac) designed for AC phase-control switching in mains-powered loads. It features uniform gate trigger currents across all three quadrants, 600 V/μs dv/dt immunity at 125 °C, and 15 A/ms commutating di/dt - enabling robust snubberless operation in dimmers, motor speed controllers, and solid-state relays.

For engineers reviewing the T12M50T600B datasheet, T12M50T600B pinout, T12M50T600B application, or T12M50T600B equivalent, key selection criteria include quadrant-trigger symmetry, high-temperature dv/dt rating, commutation robustness, thermal resistance (R_thJC = 2.2 °C/W), and TO-220AB package compatibility with heatsink mounting.

Technical Context

This triac operates bidirectionally across MT1–MT2 with gate-controlled turn-on in Quadrants I, II, and III. Its design supports zero-crossing and phase-angle control topologies, with guaranteed latching current ≤60 mA and holding current ≤60 mA at 125 °C - ensuring reliable conduction under low-load conditions.

Thermal performance is defined by R_thJC = 2.2 °C/W and R_thJA = 62.5 °C/W, supporting continuous 12 A RMS conduction at case temperature ≤90 °C. The device sustains 100 A non-repetitive surge (8.3 ms, 60 Hz) and withstands 600 V/μs off-state voltage transients without false triggering.

Key Specifications

Pinout & Package

Package: TO-220AB, insulated back, 3-terminal molded plastic case (2.0 g). Mounting hole accommodates M3 screw; tab is electrically connected to MT2.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar triac switching applications.

Compared with BTB12-600CW and MAC12A6G, the T12M50T600B offers superior dv/dt immunity (600 V/μs) and tighter gate trigger consistency (≤50 mA across all quadrants), making it preferred for noise-sensitive, high-reliability phase-control designs where snubber minimization is critical.

Availability

T12M50T600B is available at Aetrix Electronics and suitable for light dimming control, AC motor speed regulation, and solid-state relay designs requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.

Supply support for T12M50T600B includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Lite-On Technology Corporation is a Taiwan-based semiconductor manufacturer specializing in optoelectronics, discrete power devices, and analog ICs, with ISO/TS 16949 and ISO 14001 certifications.

The T12M50T600B belongs to Lite-On's KTXC28 triac product line, engineered for high-noise immunity and thermal stability in industrial AC power control applications - particularly where snubberless operation and quadrant symmetry are essential.

FAQ

What is the maximum junction temperature for continuous operation?

The T12M50T600B has a rated operating junction temperature range of –40 °C to +125 °C. For continuous 12 A RMS conduction, case temperature must not exceed +90 °C per the derating curve (Figure 5), requiring heatsink design based on R_thJC = 2.2 °C/W and ambient conditions.

Can this triac be used without a snubber network?

Yes - its guaranteed 600 V/μs dv/dt immunity at 125 °C and 15 A/ms commutating di/dt allow snubberless operation in most 50/60 Hz resistive and moderately inductive loads. However, snubbers remain recommended for highly inductive loads (e.g., contactor coils) or high-frequency noise environments.

Is the TO-220AB package electrically insulated?

No - the metal tab (MT2) is electrically connected to Main Terminal 2 and is not insulated. When mounted to a heatsink, electrical isolation (e.g., mica washer + thermal grease or silicone pad) is required unless MT2 is referenced to system ground or the heatsink is fully floating.

What gate drive voltage and current are required for reliable turn-on?

A gate pulse of ≤1.5 V and ≤50 mA is sufficient for turn-on in all three quadrants at 25 °C. At 125 °C, I_GT rises to ~40 mA (per Figure 1), so drivers should deliver ≥50 mA with ≥1.5 V compliance to ensure margin across temperature and manufacturing variation.